In order to receive Zipper T. Bunny's reward on Bunny Day - you must craft each DIY Recipe he's hidden, as well as the recipe for the Bunny Day Arch he gives you personally on the actual Bunny Day.

This Animal Crossing: Horizon guide details everything you need to know about finding and collecting all the materials needed for the Festive DIY Crafting Recipes during the Toy Day (Christmas) ...